<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <link rel="stylesheet" href="./css/style1.css">
</head>
<body>
    <!-- <a href="">百度</a>
    <div id="div1">
        <div id="title">标题</div>
        <div id="content">内容</div>
    </div> -->
    <!-- <div id="div2">
        <form>
            <input type="radio" name="sex" value="男">男
            <input type="radio" name="sex" value="女">女
        </form>
        <p>aa</p>
    </div> -->
    <div>
        <div class="div1">div1</div>
        <div class="div2">div2</div>
        <div class="div3">div3</div>
        <div class="div4">div4</div>
    </div>
</body>
</html>